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首页> 外文期刊>Journal of Asian earth sciences >Geology, chronology, fluid inclusions, and H-O-S isotopic compositions of the Hongyuntan magnetite deposit, Eastern Tianshan, NW China
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Geology, chronology, fluid inclusions, and H-O-S isotopic compositions of the Hongyuntan magnetite deposit, Eastern Tianshan, NW China

机译：中国西北天山红云滩磁铁矿矿床的地质，年代，流体包裹体和H-O-S同位素组成

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摘要

The Hongyuntan magnetite deposit, which is located in the Aqishan-Yamansu belt of Eastern Tianshan, Xinjiang, is hosted within Carboniferous submarine volcanic-sedimentary sequences. The deposit is characterized by five metallogenic stages: Stage I (garnet-diopside), Stage II (magnetite-tremolite-chlorite-pyrite), Stage III (magnetite-quartz-albite-actinolite), Stage IV (pyrite-quartz-epidote) and Stage V (hematite-limonite). Pyrite associated with magnetite formed during the Stage II has a Re-Os isochron age of 324 +/- 31 Ma. Four types of fluid inclusions were observed in the mineral assemblages, namely, two-phase liquid and vapor inclusions, multi-phase daughter mineral-bearing inclusions, multi-phase CO2-bearing inclusions, and monophase vapor inclusions. Microthermometry data reveal that the ore-forming fluids evolved from high-temperature (average 532.5 degrees C) and high-salinity (average 26.9 wt% NaCleqv) fluids to moderate-low-temperature (average 203.6 degrees C) and low-salinity (5.07 wt% NaCleqv) fluids. Magnetite precipitation may have been greatly assisted by mixing and boiling in Stage II and Stage III, respectively. The hydrogen and oxygen isotopic values of Stage I garnet (delta DV-SMOW = -107.9 parts per thousand to -76.7 parts per thousand, delta O-18(fluid) = 6.4-10.7 parts per thousand) and Stage III quartz (delta DV-SMOW = -85.5 parts per thousand to -83.2 parts per thousand, delta O-18(fluid) = 3.8-4.7 parts per thousand) indicate that the ore-forming fluids were dominated by magmatic water, whereas fluid mixing occurred during Stage II (delta DV-SMOW = -117.3 parts per thousand to -112.6 parts per thousand, delta(18)Ofluid = 3.3-5.7 parts per thousand) and Stage IV (delta DV-SMOW = -115.2 parts per thousand to -58.5 parts per thousand, delta O-18(fluid) = -1.3 parts per thousand to 4.5 parts per thousand). The variable delta S-34 values of pyrite (-3.8 parts per thousand to 4.7 parts per thousand) and delta O-18(mgt) values of magnetite (-0.6 parts per thousand to 4.1 parts per thousand) suggest that they were not sourced from a single reservoir.The Hongyuntan magnetite deposit is spatially and temporally associated with volcanism and may be genetically related to it. The fluid inclusions and isotopic compositions of this deposit indicate that its ore-forming fluid was derived from the exsolution of deep-seated magmas and that fluid mixing could have effectively triggered the deposition of ore-forming materials. Multiple periods of volcanic activity could have incorporated additional heat and ore metals into the ore-forming system. Based on our data, we conclude that the origin of the Hongyuntan magnetite deposit is related to the volcanism in the Carboniferous period.
机译：位于新疆东天山阿奇山—雅曼苏带的红云滩磁铁矿床，位于石炭纪海底火山沉积序列中。该矿床的特征是五个成矿阶段：第一阶段（石榴石透辉石），第二阶段（磁铁矿-透闪石-绿泥石-黄铁矿），第三阶段（磁铁矿-石英-阿尔比特-阳起石），第四阶段（黄铁矿-石英-闪石）第五阶段（赤铁矿-褐铁矿）。与在第二阶段形成的磁铁矿相关的黄铁矿的Re-Os等时年龄为324 +/- 31 Ma。在矿物组合物中观察到四种类型的流体包裹体，即两相液体和蒸气包裹体，多相子代含矿物夹杂物，多相含二氧化碳的夹杂物和单相蒸气包裹体。显微温度计数据显示，成矿流体从高温（平均532.5摄氏度）和高盐度（平均26.9 wt％NaCleqv）流体演化为中低温（平均203.6摄氏度）和低盐度（5.07）。 wt％NaCleqv）液体。通过分别在第二阶段和第三阶段进行混合和沸腾，可以大大帮助磁铁矿沉淀。阶段I石榴石（δDV-SMOW = -107.9千分之至-76.7千分之二，δO-18（流体）= 6.4-10.7千分之一）和III阶段石英（δDV）的氢和氧同位素值-SMOW = -85.5千分之至-83.2千分之几，δO-18（流体）= 3.8-4.7千分之一）表明成矿流体主要是岩浆水，而流体混合发生在第二阶段（增量DV-SMOW = -117.3份至-112.6份，δ（18）流体= 3.3-5.7份/千）和阶段IV（增量DV-SMOW = -115.2份至-58.5份/千千，δO-18（流体）= -1.3千分之4.5至千分之四）。黄铁矿的变化δS-34值（千分之3.8至4.7千分之一）和磁铁矿的δO-18（mgt）变化值（千分之0.6至4.1千分之四）表明它们不是来源红云滩磁铁矿矿床在时间和空间上与火山作用有关，可能与之成因有关。该矿床的流体包裹体和同位素组成表明其成矿流体来自深部岩浆的解吸，流体混合可能有效地触发了成矿物质的沉积。多个时期的火山活动可能已经将额外的热量和矿石金属纳入了成矿系统。根据我们的数据，我们得出结论，红云滩磁铁矿矿床的起源与石炭纪时期的火山作用有关。

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